Create required directories

mkdir -p /etc/docker/nginx/{conf.d,html}

Configure nginx as webserver

cat < /etc/docker/nginx/conf.d/default.conf
server {
    listen 80;
    server_name _;

    root   /usr/share/nginx/html; 
    index  index.html index.htm;
}
EOF

Configure nginx as proxy

cat < /etc/docker/nginx/conf.d/proxy.conf
server {
    listen 80;
    server_name foo.example.com;

    location / {
        proxy_pass http://localhost:8080/;
    }
}
EOF

Create container

sudo docker run -d \
  --name nginx \
  --net host \
  -v /etc/docker/nginx/html:/usr/share/nginx/html:ro \
  -v /etc/docker/nginx/conf.d:/etc/nginx/conf.d:ro \
  nginx

debug

docker restart nginx
docker logs nginx -f

Links
https://hub.docker.com/_/nginx